The Geology of the Carboniferous Limestone, Yoredale Rocks, and Millstone Grit of North Derbyshire and the Adjoining Parts of Yorkshire (Sheets 81 N.E., 81 S.E., 72 N.E. and Adjoining Parts of 88 S.E., 82 N.W., 82 S.W. and 71 N.W. of the Map of the Geological Survey)